import junit.framework.TestCase;

public class MyUtilTest extends TestCase {

    @Test

    public void testNormal() {

        assertEquals("不及格", MyUtil.percentage2fivegrade(55));

        assertEquals("及格", MyUtil.percentage2fivegrade(65));

        assertEquals("中等", MyUtil.percentage2fivegrade(75));

        assertEquals("良好", MyUtil.percentage2fivegrade(85));

        assertEquals("优秀", MyUtil.percentage2fivegrade(95));

    }



    @Test

    public void testExceptions() {

        assertEquals("错误", MyUtil.percentage2fivegrade(105));

        assertEquals("错误", MyUtil.percentage2fivegrade(-55));



    }



    @Test

    public void testBoundary() {

        assertEquals("不及格", MyUtil.percentage2fivegrade(0));

        assertEquals("及格", MyUtil.percentage2fivegrade(60));

        assertEquals("中等", MyUtil.percentage2fivegrade(70));

        assertEquals("良好", MyUtil.percentage2fivegrade(80));

        assertEquals("优秀", MyUtil.percentage2fivegrade(90));

    }

}
